Flix Plus won't install Microsoft Silverlight to play Netflix video

Why won't the Silverlight that I have in my Applications folder allow Flix Plus to play Netflix video? When I click on a movie, it says install Silverlight for this video. I clicked INSTALL NOW and nothing happens. I could not seem to get anywhere finding tech support help, so I am trying this discussion. I am using a Mac running El Capitain (Mac OS 10.11.6). Attaching screen shot so that you can see where the window gets stuck. So far, I haven't be able to watch anything. I'm sure it's a simple solution. I really want to try it before requesting a refund. Thank you. --Sheba